Mechanical stoker



Nov. 3 1925. k

W. T. HANNA MECHANICAL STOKER 2 sheets-sheet 1 Filed July 5, 1919 Nov. 3 1925.

w. 'T( HANNA MECHAN I CAL S TOKER Filed July 5, 1919 2 Sheets-Sheet 2 95: van for;

Earn 8 I Patented Nov. 3, 1925.

UNITED STATES- 1,560,083 PATENT OFFICE.

WILLIAM T. HANNA, OF CINCINNATI, OHIO.

MECHANICAL sroxnn.

Application filed July 5,

To all whom it may concern:

Be it known that I, lVILLIAM T. HANNA, a citizen of the United States of America, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and useful Improvement in Mechanical Stokers, of which the following is a specification.

My invention relates to a class of mechanical stokers which are particularly adapted foruse in stoking locomotive engines.

The object of my invention is to provide a stoker which when in position does not interfere with free access to the furnace opening, so that hand stoking may be resorted to readily.

Another object of my invention is to provide an improved means for mounting the fuel conveyors.

These and other objectsare attained .by the means described in the specification and illustrated in the accompanying drawings,

' in which Fig. 1 is a rear elevatipnof a mechanical stoker embodying my invention.

Fig. 2 is a side view thereof. upon a somewhat enlarged scale.

Fig. 3 is a view partly in section and part ly in elevation, and upon an enlarged scale of the manually operated means for connecting and disconnecting the guide wings from their operating shafts.

Fig. 4 is a detail rear elevation of the furnace opening-and of the wings in their inoperative position.

a Fig. 5 is a sectional detail view upon line. 5--5 of Fig. 3., V

Centrally located beneath the furnacetaken door-opening A,-is an inclined feed tube' B to the mouth of which is secured a cas-- ing 6' within which casing is revolubly mounted a suitable spiral screw 6 whereby fuel may be conveyed from a fuel reservoir, not shown, to and thru the feed tube B. The casing b and screvw b together with the tube B constitute a primary feeding and elevating conveyor, discharging into an intermediate conveyor comprising the casing D; r

At its upper end feed tube "B is coupled centrally to and communicates with a secondary easin D which is secured. to the rear wall of t e engine boiler in a horizontal positionbeneath the furnace-door-opening or primary firing opening A. The casing 1919. Serial No. 308,851.

I) and the spiral screws therein contained, constitute a horizontal or intermediate conveyor. 'At the ends of the casing D, inclined fuel conduits E, E enter the sides of a casing a which surrounds the fur.- nace door or primary firing opening A and has in its rear wall an opening A in substantial horizontal alignment with the opening in the furnacev wall. The forward wall of the casing 64 is provided with suitable flanges a) whereby the easing may be secured to the boiler wall. The forward wall of the casing 01. has an aperture which registers with the primary firing opening, or if desired, the forward wall may be dispensed with, the objective being the provision of a chamber between the rear wall of the casing a and the rear wall ofthe fire box or boiler, in which chamber the distributing wings may be oscillated and thru which chamber unobstructed access may be had to the primary firing opening whereby to permit hand firing without re moval or displacement of any of the stoker mechanism. conduits E, E with the casing-D, there are formed journal bearings d, d in which are journalled a horizontal shaft 03 and the lower ends of the shafts of; screws 6, "e. Shaft d has mounted upon it spiral blades d d of opposite spirality. The shafts carryingithe screws 6, e are connected by bevel gears to the shaft (11 which carries .a pinion d which is connected with an actuating mechanism not shown.

A are revolubly mounted-longitu inal stub shafts g, 9, upon which 1 are secured distributing wings or chutes G, G which normally are in position to receive fuel discharged from the upper ends of conduits E, E, and to direct and discharge it upon the distributing plate 71. and ejector h, extending intothe primaryfiring opening A. The conduits E and, E contain revoluble spiral screws 'e and a respectively, and constitute secondary elevating conveyors communicating at their lower ends with the intermediate conveyor, and converging toward their tops where they dischar e into the guide wings G and G which istribute the fuel upon the distributing plate.

The means for manually connecting and disconnecting the distributing wings from their operating mechanism H, is as fol- At the junctures of. thewfuel lowsz-Upon each of the shafts g, g a arms 9 by grasping handles 9 and swingsleeve 9 is secured, which has an upwardly projecting arm 9 upon which is pivoted a handle 9, which has a. lug g which is adapted to engage a notch in an .arm g which projects upwardly from a sleeve 9 which is mounted loosely upon the stub shaft g. Sleeves 9'' have arms 9 which are connected by links g with the operating mechanism H. This operating mechanism is described in Reissue Letters Patent No. 14,17 9, re-issued Aug. 8, 1916, for a mechanical stoker of my invention, and need not therefore be more specifically described herein. The device. H is adapted to control the operation of the wings G and G and com prises a suitable reciprocating rod 72. to which links 9* are pivotally connected. As the reciprocating rod h=is actuated, the reciprocating motion thereof is translated into an oscillating motion of the wings about their re spective pivotal mountings, whereby the wings direct fuel from' the elevating conveyors comprising conduits E and E and screws 6 and c to the distributing plate It and ejector 72%.

Upon the sides of the furnace are secured plates 9 g, which have in them notches which are adapted to be engaged by the lu s g of the handles 9 when the wings G, are brought into their inoperative positions such as shown in Fig. 4, so as to hold the wings clear of the passage leading from the furnace door openin to the fire box.

In operation fuel is carried thru the prig. mary conveyor and is forced by incoming fuel upward into the casing D. The spiral blades d, d convey the fuel to the conduits E, E, the screws 6, a carry it upward and it is discharged onto the distributing wings G, G which in their oscillation distribute it upon the distributing plate to be conveyed thence by a suitable ejector into the fire box.

The operation of rendering each of the wings or chutes G, G inoperative, and

1ng them around their pivots. The wings are then manually rotated about their re spective shafts g and g. Vhen the wings ositions free of the have been swung to passage, they are locke in position by lodging the lugs g in slots in the plates 9 and g. In this position ofthe wings the furnace door opening is unobstructed so that hand stoking may be readily resorted to.

Although the casing a, casing D, and feed tubes E and Eare shown and referred to as separate elements, it is readily apparent that they may be formed integral, whereby to form a single composite housing within which the several operating mechanisms are contained. As shown, the several referred to parts are for all purposes to be considered as a single housing.

Havin what I c aim is:

1. In a mechanical stoker for a furnace having a furnace door opening, the combination of a horizontal convey'er disposed below the furnace door opening adapted to move fuel towards its opposite ends, upwardl converging conveyers communicating with the ends of the first mentioned conveyer terminating adjacent the sides of the furnace door opening, and means directing the fuel fromthe second mentioned conveyers to the firing'door opening. 7

2. The comblnation with a furnace having a firing opening in its wall, of a housing mounted upon the exterior of the wall embracing the opening, said housing having a wall spaced from the furnace, said wall having a firing opening in alignment and registhusdescribed my invention,

tering with the firing opening of the furnace, and a distributer in the housing adapted to o erate across the passage between the two ring openings, and to assume an inoperative position withdrawn from said passage.

In testimony whereof, I have hereunto swinging them free of the passage extendsub ribed my name thi 3 d da f J l or,

ing between the prima and secondary firing openings is as fol owsz-Lugs g are released from the notches in their respective WILLIAM T. HANNA. 

